Abstract
The concentration of oxygen in the hydrocarbon region of lipid bilayer has been determined using a novel electron spin resonance (ESR) nitroxide-radical spin-probe method. For dimyristoylphosphatidylcholine (DMPC), the partition coefficient above the main transition temperature is approximately 3. Rapid decrease to 0.2 occurs below the pretransition temperature indicating exclusion of oxygen in the crystalline phase. The differences of molar free energy, enthalpy, and entropy of mixing between water and lipid have been determined for each phase.
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